Drier for yeast and the like.



'Jw-H- A. WPQQENER, DRIER ron YEAST wigaas LIKE. 4

APPLICATION FILED rink/ 1914.

Patented Feb. 16, 1915.

71/ F e b W a e1 7f I m g:

inesse's DRIER non YnAs'r AND THE LIKE.

Specification of Letters Patent Patented Feb. 16, 1915.

Application filed February '7, 1914. Serial No. 817,371.

T all whom it may concern:

Be it known that I, 'JOHANN HEINRICH Auc-Us'r Wrnsnrnn, manufacturer, a subject of the German Emperor, residing at No.103 Steindamm, Hamburg, Germany, have in vented new and useful Improvements Relating to Driers for Yeast and the like, of which the following is a specification.

This invention relates to a drier for yeast and the like, having a rotary heating drum and a scraper for the removal of the dried yeast from the surface of the heating drum; according to the invention an improved construction of drum is used, formed of a heating jacket through which a heating medium is caused to circulate continuously, while means are provided for insuring that only a uniform layer of,yeast to be dried can cling to the drum. The heating medium is supplied to the jacket of the drum in the well known manner through one of the trunnions of the drum, while the other trunnion serves for the outflow of the steam -or condensed water. Each trunnion is connected with the heating jacket by a number of arms of which one is hollow in order to conduct the heating medium respectively from one trunnion into theheating jacket and from the heating jacket out through the other trunnion.

A further essential feature of the invention is the employment and construction of the trough, adapted to-receive the material to be dried, and in which the drum turns. The bottom of this trough is completely or partly hollow for the passage of a heating medium (steam) for the purpose of effecting the preliminary heating of thematerial to be dried which is contained therein.

An example of cons'tructionof the invention is illustrated in the accompanying drawings in which Figure 1 is a cross-section on the line A-B of Fig. 2 and Fig. 2 is a'section on the line CD of Fig. 1. Fig. 3 is a detail.

The drum comprises the heating jacket 41 secured to two sets of arms I), I), each of which sets is provided with a trunnion a, c"

for supporting the drum, these trunnions being arranged to turn in the supports (2 and cl. Along-the axis of each trunnion c and of is formed a passage 0, e which con-. tinues through one of the arms 6, b and terminates in the heating jacket a. Pipes 7 and f are packed in stufling boxes 9, g in the ends of the trunnions a a, and serve for the supply and outflow of the heating medium. On the trunnion a is mounted a worm wheel h whlch gears with a worm z keyed to a shaft Ir: mounted in the support 12, and driven by any suitable means.

Behind and against the rake Z is a cross bar at. The yeast is supplied in solid form to the trough, behind this plate, through a hopper n, and the yeast can only pass through the rake into the part of the trough belowthe drum, gradually as it only becomes liquefied by the application of heat. On the trough m is advantageously mounted an adjustable flat plate a which fitsasclosely as required against the periphery of passage of any lumps or foreign bodies of any description, while permitting even at the commencement of the drying operation, only a thin layer of the yeast to be dried to cling to the drum. Opposite the flat plate a there is provided on the trough mor in the machine frame a scraper r,- the sharp edge of which rests against the periphery of heating jacket a.

the heating jacket a in order to prevent the so The operation is as follows :The drum is rotated and at the same time steam is admitted through the pipes f and o intothe heating jacket on and the hollow bottom 72 of the trough m. When the placket a and the trough m have been sufficie the yeast to be dried is supplied to the lat; ter. By the action of the heat the yeast is easily liquefied and drawn around by the drum rotating in the direction of the arrow Fig. 1. By reason of the provisionof the flat plate (7 only a thin layer clings to the peripheral surface of the jacket a and after passing over a certain distance and be ing completely dried it is removed by the scraper 1'. The thin layer of material may if desiredbe worked by suitably arranged pressing rollers or the like, on its passage from the trough m to the scraper r.

What I claim is:

1. A drier for yeast and the like compris- I ing a trough, a cylinder revoluble in the tly warmed, 9

said trough, means for heating the cylinder and the trough, a rake within the trough Teaching toth'e bottom thereof whereby the yeast is fed to the cylinder in liquid state,

and means for collecting and'removing the yeast from theroller, the parts arranged as and for the purpose described.

2. A drier for yeast and athe :like comprising a double-walled trough, a double- Wa'1ledcy1inderrevoltrbie' within the said derwand.renriovinp, it: therefrom, the parts arranged as-and-for-"the purpose described 3. A" drier for-yeast? and the alike 'comprising a trouszhhaving a double-.wallthrough- .out a portion of its length, a double-walled cylinder revoluble Within the saidtank, the tank provided with a hopper, a rake within the tank between the hopper and the cylinder providing means whereby the yeast is supplied to the roller in a liquid state and allowed to adhere thereto, means for regulating the amount of yeast adhering to the ro]ler and means for removing it therefrom, the parts arranged as and for the purpose described.

- In testimony-whereof I have signed my name to this specification in the presence of two subscribing Witnesses, this 24th day of January, 1914.

JOHANN HEINRICH AUGUST WIESENER. Witnesses: v EDWARn- PETER HEINRICH ERNSTEIN,

ERNEST H. L. MUMMENHOFF. 

